Fix a crash in Python frameworks that was due to protobuf relocating mesos_pb2.py.
Fix a crash in Python frameworks that was due to protobuf relocating
mesos_pb2.py.

charlescearl/VirtualMesos,charlescearl/VirtualMesos,charlescearl/VirtualMesos,charlescearl/VirtualMesos,charlescearl/VirtualMesos,charlescearl/VirtualMesos,charlescearl/VirtualMesos,charlescearl/VirtualMesos,charlescearl/VirtualMesos